Internal-combustion engine



April 5, 1927.

E. R. BLJR'rm-zrrV INTERNAL COMBUSTION ENGINE Filed oct. s, 1924 In.' "I

of the crank shaft; to vconnect the pistons PatentedA Apr. 5, 1927.

1,623,387 oNiTED.sTATEsj PATENT OFFICE. V f

EVERETT n; EURTNETT, or Los ANGELES, CALIFORNIA, AssIeNoIi, BY lDIRECT AND MEsNE ASSIGNMENTS; To THE AUTOMOTIVE VALVES co., oE Los ANGELES, GALI- FORNIA, A VOLUNTARY TRUST.

,Y IN'TERNAL-coMBUsTIoN ENGINE.

Appiieetion iiied ocotber s', 1924. serial Ne, 742,405.

My invention relates to intern-al combustion engines `of the two stroke cycle type, vthe principal objects i t to generally improve upon and simplify the construction of the existing forms of two stroke cycle internal combustion engine; to provide an engine hav-ing four combustion cylinders arranged in a row parallel with ing cylinders in transverse alinement withl the inner Amembers of the row of four combiistion cylinders; to provide the engine thusconstructed wih a two throw crank shaft, the throws or cranks of which are arranged diametrically opposite to each other; v tov connect the pistons within each pair of combustion cylinders to one of the throws within thevpumping cylinders to the respec-v tive throws of the crank shaft; and to provide each throw Vor crank of said .crank shaft with a counterbalancing member that is disposed between the connecting rods that. are connected to'sai'd ,crank or throw.'

A:Vtith the foregoing and other objects inview, my invention consists in the features of construction and combination and arrangement of parts hereinafter morel fully Y described and claimed, reference being had to the accompanying drawings, is wliich.'-v Figurefl is a top plan view of an vinternal. combustion engine of my improved construction; n

Figure 2 is a vertical cross section taken- 4 on the line 2--2 of Figure 1; y

Figure Jis a vertical section taken 'ap proximately on the line 3-3 of Figure 2.

Y Referring by numerals lto the accompany- Y ing drawings, which illustratea practical Aembodiment of in invention, 10 desi ates f a cylinder block in which are-'forme vffour combustion chambers 11, 12, 13 and 14. The axes of these cylinders are arranged'parallelA i with each `otherfaiid the Vfour cylinders are 11i-ranged inpairs with 'the cylinders 11 and 'of my invention being 12 constituting oiic'pair and cylinders and 14 the other pair.v

The head end of block 10 is closed by a head block'15, and formed in the under sidethereof are shallow pockets or chambers 16 and 17, said chamber 16 connecting the head ends of combustion chambers 11 and 12 and providing a common clearance compression niidigiiition chamber therefor. In a similar manner, chamber 1.7 connects the head ends f ot' combustion chambers 13 and' 14 and provides a common clearance compression and ignition chamber therefor. Pistons 18 and .15) are arranged foi operation, respectively, I

iircliambers 11 and 12, and similar pistons v'2O and 2l' are arranged for operation,'

respectively, lin chambers 13 and 14. Ar-

ranged in head 15 and preferably at points directly above the chambers l2 and 13 are -ignition idevices, such as spark plu and the inner ends of the electrodes tiereof project into the common clearance chambers 16 and 17.

Arranged below cylinder block -10 is a crank case 23 provided with suitably located bearings 24 for a crank shaft 25, the latter having two throws 26 and 27 that are disposed diametrically opposite to each other or 180 apart. Pistons 18 'and 19 are connected, respectively, -by suitable connecting rods 28 and, 29 to crank 26, and in like manner, pistons 20 and 21 are connected, respectively, by connecting rods 3() and'31 to crank 27. Connected to the central portion4 of crank .26 and between the corresponding ends of connecting rods 28 and 29 is a coun# terb'alancing member 32, and connected Ato the central portion of crank 27 between the corresponding ends of connecting rods- 30 and 31 is a similar counterbalancing meinber 33. Arranged above crank case 23 and singularly disposed with respect to the row ofbcoinbustion cylinders .in block 10l is a block v34e in which are formed two pumping.

chambers, such as 35, the axes of which are parallel with eachother, and these pumping c vlindersare disposed so that their axes are respectively in transverse alinement .with the axes of l 12and13. 4

I prefer to construct-the blocks -10 and 34' so that the axes of all of the chambers therein intersect the axis of crankshaft 25. Ar-

the combustion chambers y c-hambers are gaseous fuel pumpingcranks 26 f and '2 7.

As a result of the arrangement of the pumping c linders with'rela'tion to the com-- bustioncy inders 12 andl3, the connecting rod from one ofthe -gaseous fuel pumping pistons is connected to crank 26 immediately adjacent to connecting rod 29, and to accomplish this connection the lower-end of the connecting rod from the pump piston is preferably provided with a yoke, such as 38, that engages crank throw 26 tothe side of the lower end of connecting rod- 29. In like manner, the lower end of the connecting rod from the piston in the other pumping cylinder is provided with a yoke, such as 39, that engages crank'27 immediately to the side of the lower-end of connecting rod 30. I prefer toy arrange the main `bearings 24 for the crank shaft so 4t-hat there is a bearing at each end of each crank throw, vand as a result of such arrangement and the provision of the'counterbalancing weights 32 and 33 the crank shaft is balanced so as to minimize vibration during engineoperation.

The chambers withinv the gaseous fuel pumping cylinders ,are provided withsuitgaseous fuel inlet ports, such as 40, that are, onnected to a suitable source of gaseous fuel supply,such as a carbureter,

and the upper ends of thechambers withinsaid pumping cylinders are connected by snitab e cross ducts 41 to the combustion chambers 12 and 13. These transfer ducts i 41' are 'crossedbetween 'the pumping and ycombustion cylinders in order that the pumping cylinder that-is intransverse alinement with combustion cylinder 12 functions for the' .delivery of compressed gaesous fuelinto combustion chamber 13, and the pumping cylinder 34 that-is in tansverse alinement with combustion cylinder 13 functions for the delivery of precompressedy gaseous fueLinto combustion chamber 12., The gasi -eoussfuel inlet ports 40 and the precompressed gaseous fuel Iinlet ports into the'combustion cylinders 12 and 13' are located so that they are uncovered and open only when the corresponding pistons are at the lower or'outer -ends of their stroke. Combustion` chambers lland 14 areprovided `withcexhaustports 42 tha-tare locateds'o that they are uncovered and openonly. when pistons cranks 26 and .1S-and '21 are at'thelowe'r or outer ends. ef

theirstroke.-

In the operation of myimproved engine, the diametricall" opposite arrangement of are sud! thatlt e two' sets of pistons move simultaneouslybnt in? opposition or in 2 and the connections from' the istons 'inthe -pum ing cylinders to said C cross-over arrangement of the ducts 4l each pumping piston on its upward stroke compresses gaseous fuel in the upper portion of its chamber and the .duct leading therefrom,A and when the pistons in the combustion chamber to which the respective duct is connected passes low centerand uncovers vthe gaseous fuel inlet portsto which said duct leads the compressed gaseous fuel charge, is admitted to the correspondingcombustion cylinder and passes upwardly therethrough,

thence through the corresponding. common clearance chamber, and thence downward through the other combustion cliamber of stroke ofthe pistons within the connected combustion chambers, the gaseous 'fuel charge ,admitted as just described will be compressed in the corresponding common clearance chamberuntil the pistons in the combustion Vchambers pass high center, at which time. the compressed gaseous fuel charge will be ignited by a spark produced between the terminals of the corresponding spark plug. The expansion following combustion of `the compressed gaseous fuel charge Vwill drive the pistons downward on their power stroke, and as the piston in eachV pumping cylinder is connected to the same "crank with a pair of thepistons in the combustion cylinders, each pumplng piston will operate simultaneously with the pair of combustioncylinder pistons with which it is associated, but owing to the crossed ducts 41 the gaseous -fuel pumpedby each pumping piston willbe transferred to the other pair of combustion cylinders, while the pistons therein are passing low center and while the transfer :inlet ports are open.

The counter-balancing weights 32 and 3 3 are disposedcentrally on the cranks 26 and 27-between the piston rods that are connected thereto, and, consequently, a perfectly balanced rotary -nias's is provided, thus mini;

mizing the` development of vibration inthe crank shaft and associated partsv,- while the engine is in operation'. l It will be understood that various changes may be made inthe form, size and construcwhich is set forth in the appended claims.-

I claimas my invention: g 1 In a two stroke. cycle internal combustion engine, aseris of four combustion-c l- -inders arranged in a row,l said -four cylin- 'dersbeing arranged in two pairs with-the head endsof the members of each pair connected by, a'Y common clearance chamber a tion of' my improved two stroke 'cycle in'- 1 20' for the `lpumppair of cylinders functioningelivered to said ing of gaseous fuel that is combustion cylinders, said gaseous fuel in transverse alignment -with the inner two members of the row of combustion cylinders, pistons arranged for o eration within all of said c linders, a cra shaftjhavmg:

two crank t rows that'are arranged-180 crank shaft.

apart, and connections from`the pistons in,

each air of combustion cylinders and from the pistons in one of the gaseous fuel pumping cylinders to each crank throw 4of the 2. In a two stroke ,cycle internal combustion engine, a series of four combustion cylber centrally arranged on each cran of the crank shaft, between the piston conindersarranged in a row, said four cylinders being arranged in two pairs with the' 'head ends of the members of each-pair connected by a common clearance chamber, a pair of cylinders functioning for the pumping of gaseous fuel that is delivered to said combustion' cylinders, said gaseous fuel pumping cylinders being disposed at an angle relative to the plane occupied by the row of combustion cylinders,.th e two gaseous fuel pumping cylinders being disposed in transverse alignment with the two inner two members of the row of combustionpylinders, pistons arranged for operation within all of said cylinders, a crank shaft having two crank throws that are arranged 180"A apart, connections from the pistons in each pair of combustion cylinders and from the piston in one of the gaseous fuel pumping cylinders to each crank throw of the crank shaft, and a counterbalancin memthrow nections thereto. Y.

'3. In a two stroke cycle internal combustion engine, a series of four combustion'cylv inders disposed in a`row with said four cylinders `arranged in pairs and the head ends of the members of eachpair connected by a common1 clearance chamber, a air of gaseous fuel pumping cylinders, t 1e members 'one of the pumpin 'cylinders to each crank of which are in transverse alignment with the two inner combustion cylinders of the row, a crank shaft having two crank throws that are arranged diametricall opposite to each other, istons arranged or operation within all of)the,cylinders, and connections from the pistons in each pair of combustion cylinders and the piston in one of thepumping cylinders to each throw 'of the crank shaft'.

l 4. In a two stroke cycleinternal combustion engine, a series of'four combustion cyl- '.inders disposed in a row with said four'cylinders arrangedin pairs and the head ends of the members of cach pair connected by a common clearancechamber, a pairiof gaseous fuel pumping cylinders, t e members of which are 1n transverse alignment with the two inner combustion cylinders'of the row, la crank shaft having two crank throws that are arranged dametrically opposite to each other, pistons arranged for operation within, all of the cylinders, connections for the pistons-in each pair ofcombustion cylinders andthe piston in one of the pumping cylinders 'to each throw of the crank shaft, and counterbalancing means carried by ea-ch crank throw of the crank shaft be `tween the piston connections thereto.

-5. -In a two stroke cycle internal combustion engine, a series of four combustion. `cylinders arranged 1n a row,

pair of gaseous fuel pumping cylinders, aid pumping cylinders being oifsetffrom the row of com-A bustion cylinders and occupying positions?- in transverse alignment with the two inner cylinders of said row of combustion cylinders, gaseous fuel ducts arranged between each pumping and one member of the row of combustion cylinders, a crank shaft hav- V ing two rows-that are arranged diametrically opposite to each other, pistons arranged for operation/within said combustion and pumping cylinders, and connections from the pistons in each pair of combustion cylinders and the piston in one of the pumping cylinders to eachcrank throw of the crank shaft. i v f 6. In a two stroke cycle internal combustion engine, a series of four combustion cylinders arranged in a row, a air of aseous fuel pumping cylinders, sai pumpmg cylinders being offsets from therow of v l combustion' cylinders and occupying positions intransverse ali nment with the t-wo inner cylinders of sai row ofcombustion cylinders, gaseous fuel ducts arranged betweenl each pumping cylinder and one member of the row of combustion cylinders, a

lcrankshaft having two crank throws that are arranged diametrically opposite to each other, pistons arranged for operation within said-combustion and pumping cylinders,

connections from the 'pistons 'in each pairv l of combustion cylinders and the piston' inv throw of the cran shaft, and 'counterbal-A ancing members arranged onthe throws of the crank shaft between the piston connections thereto. l

, 7. In an internal combustion engine, a two'l stroke cycle internal combustion unit of six' cylinders, four of which are disposed in a row and functioning as combustion'cylinr ders, the other two cylinders of the unit-be- 12" ing arranged in transverse alignment-1re-v s ectively, with the two inner cylinders of t e row. ofv four combustion cylinders4 and functioning for the vpumpin fuel to the combustion cylin ers, a crank of gaseous rectly connected'to the same crank throw ofy shaft having two crank throws, pistons ar the piston within the corresponding transversely aligned pumping cylinder being dithecrank shaft and the piston within the first cylinder from each end of the row of combustion cylinders having a separate connection to the corresponding crank throw of the crank shaft.

8. In an internal combustion engine, a two stroke cycle internal combustion unit of six cylinders, four of which are disposed in -a row and functioning as 'combustion cylinders, the other two cylinders of the unit being arranged in transverse alignment revspectively,.with the two inner'ylndrs of the row of four combustion lcylinders and functioning for' the pumping of gaseous vwithin the second cylinder froml either end of the row of four combustion cylinders and the piston within the corresponding. transg versely aligned pumping 'cylinder being directly connected to the same crank throwo.v thev crank shaft and the piston within the first cylinder fromeach end of the row of combustion cylinders having a separate connectin to the corresponding crank throw of the crank shaft -and a counterweight conneoted to each crank throw between .the connection to the piston in the first cylinder in the row-fof -four combustion cylinders and the connections to the piston in the second cylinder inthe rowwand lthe -piston in the transversely 'aligned'pumping cy1inder.

In testimony whereof I aifix my signature.

EVERETT R. BURTN ETT. 

